Test: Distribution System
10 Questions MCQ Test Power Systems | Test: Distribution System
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A DC 2-wire system with mid-point earthed having cross-sectional area of each conductor be ‘a’ and resistance ‘R1’. If the DC tow wire replaces the system, then the ratio of volume of each conductor V1/V2 will be ___________
Let the power losses remain constant over the systems, then
2P2R/V2 = 2P2R1/2*V2
or, R = R1/4;
As R = lρ/a;
a1 = a/4;
So, V1/V1 = 1/4.
A DC 2-wire system with mid-point earthed having cross-sectional area of each conductor be ‘a’ and resistance ‘R1’. If this is replaced by monopolar system, then saving of copper will be ______
Let the power losses remain constant over the systems, then
2P2R/V2 = 2P2R1/V2
or, R1 = R
As R = lρ/a;
a1 = a
So, V1/V1 = a1 * 2l/a1 = 1/2.
For the given distribution system the maximum voltage at the midpoint will be ________
Vmax = V/√2 = (440/2)/√2 = 155.6 V.
A transmission and distribution engineer needed to design the sub transmission substation. The tapping component needed will be ______.
For the sub transmission level, there is no tapping at various level does not take place. For this a feeder is used.
A _________ distribution system is more reliable than the ______ distribution system.
A parallel distribution system has two end feeding and an alternative of parallel line, so in case there is a fault, the isolator can isolate the faulty part and let the healthy system operate.
For the figure shown, having a 2-wire dc system where mid point is unearthed, having resistance of 20 ohms, with a power transmitted of 5 MW at the voltage level of 440 kV.
The power loss of the distribution system will be ________.
I = P/V = 5000000/440000 = 11.36 A
Power loss = I2 * R = 2 * 11.362 * 20 = 2583 W.
While designing the distribution sub stations by the designer, it is required to use the _______ for the discrete power tapping.
For the discrete tapping of the power the consumer level it is the distributor which is employed at the sub stations and consumer levels.
For the single phase 2-wire system, the maximum voltage between the outer wires and earth is ________
The midpoint voltage will be V/√2.
For the figure shown, having a 2-wire dc system where mid point is earthed, having resistance of 20 ohms, with a power transmitted of 5 MW at the voltage level of 440 kV.
The power loss of the distribution system will be __________
I = P/V = 5000000/440000 = 11.36 A
Power loss = 2I2 * R = 2 * 11.362 * 20 = 5165 W.
While designing the distribution to locality of one lac population with medium dense load requirement, we can employ ________.
A radial system is used for the medium requirement of loading and a medium dense population as it becomes easier to install and operate.
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